RL78/F13, F14 CHAPTER 16 SERIAL INTERFACE IICA
R01UH0368EJ0210 Rev.2.10 1057
Dec 10, 2015
(2) When communication reservation function is disabled (bit 0 (IICRSV0) of IICA flag register 0 (IICF0) = 1)
When bit 1 (STT0) of IICA control register 00 (IICCTL00) is set to 1 when the bus is not used in a communication
during bus communication, this request is rejected and a start condition is not generated. The following two statuses
are included in the status where bus is not used.
ï‚· When arbitration results in neither master nor slave operation
ï‚· When an extension code is received and slave operation is disabled (ACK is not returned and the bus was released
by setting bit 6 (LREL0) of the IICCTL00 register to 1 and saving communication)
To confirm whether the start condition was generated or request was rejected, check STCF0 (bit 7 of the IICF0
register). It takes up to 5 cycles of the operation clock (f
MCK) until the STCF0 bit is set to 1 after setting STT0 = 1.
Therefore, secure the time by software.
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